单项选择题

The integration of staff for training has led to a good exchange of ideas, greater enthusiasm, and higher staff ______.

A．moral
B．mortal
C．morale
D．mores
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单项选择题
Attempts to persuade her to stay after she felt insulted were ______.
A．of no avail
B．out of focus
C．at a loss
D．in no way
单项选择题
Scientists are ______ certain that there is a cancer-inhibiting agent in the blood of the shark.
A．dubiously
B．virtually
C．queerly
D．randomly
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